Fan filter unit



FIG. 1 is a front, top and right side perspective view of an fan filter unit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a cross-sectional view taken along lines 8-8 in FIG. 2.

The broken lines shown in the drawings represent portions of the fan filter unit that form no part of the claimed design. 

CLAIM I claim the ornamental design for a fan filter unit, as shown and described. 